Answer:
632–1723 Anthonie van Leeuwenhoek (1632-1723). Natuurkundige te Delft Rijksmuseum Antonie van Leeuwenhoek Dutch Considered to be the first acknowledged microscopist. Van Leeuwenhoek was the first to observe microscopic organisms, using simple single-lensed microscopes of his own design.[1]
1729–1799 Lazzaro Spallanzani Italian Proved that bacteria did not arise due to spontaneous generation by developing a sealed, sterile broth medium.[2][3]
1749–1823 Edward Jenner Edward Jenner English Developed vaccination techniques against smallpox.[2]
1818–1865 Ignaz Semmelweis Ignaz Semmelweis Hungarian Demonstrated that doctors washing their hands with chlorine solutoin significantly reduced mortality of women giving birth in the hospital setting.[4]
1853–1938 Hans Christian Gram portrait Hans Christian Gram Danish Developed the Gram stain used to identify and classify bacteria.[2]
1845–1922 Charles Laveran Charles Lavaran French 1907 Nobel Prize in Physiology or Medicine for discovering the causative agents of malaria and trypanosomiasis.[2]
1827–1912 Joseph Lister Joseph Lister English Introduced sterilisation techniques to surgery.[2][5]
1822–1895 Louis Pasteur, foto av Paul Nadar, Crisco Louis Pasteur French Seminal discoveries in vaccination, food safety, and microbial fermentatoion. A key proponent of the germ theory of disease.[2]
1850–1934 Fanny Hesse German Developed agar for use in culturing bacteria.[2][6]
1851–1934 Martinus Beijerinck Netherlands Discovered the first virus as well as bacterial nitrogen fixation and sulfate reduction.
1885–1948 Marjory Stephenson British Pioneer of bacterial metabolism.
1871–1957 Kiyoshi Shiga Japanese Discovered a bacterium causing an outbreak of dysentery.[2][7]
1854–1917 Emil Adolf von Behring German 1901 Nobel Prize for Physiology or Medicine for discovering diphtheria antitoxin.[8]
1857–1932 Sir Ronald Ross British 1902 Nobel Prize in Physiology or Medicine for discovering that malaria is transmitted by mosquitoes[9]
1843–1910 Robert Koch German 1905 Nobel Prize in Physiology or Medicine for work on tuberculosis; identified causative agents of tuberculosis, cholera, and anthrax.[10]
1845–1922 Charles Louis Alphonse Laveran French 1907 Nobel Prize in Physiology or Medicine for recognizing parasitic protozoa as the causes of malaria and African sleeping sickness.[11]
1857–1940 Julius Wagner-Jauregg Austrian 1927 Nobel Prize in Physiology or Medicine for discovering the neurosyphilis could be treated by inducing fever with malaria parasites.[12]
1866–1936 Charles Jules Henri Nicolle French 1928 Nobel Prize in Physiology or Medicine for determining that typhus is transmitted by body lice.[13]
1895–1964 Gerhard Domagk German 1939 Nobel Prize in Physiology or Medicine for the discovering the first commercially available antibiotic: prontosil.[14]
1881–1955 Sir Alexander Fleming Scottish 1945 Nobel Prize in Physiology or Medicine for discovering penicillin.[15]
1906–1979 Sir Ernst Boris Chain British
1898–1968 Howard Walter Florey Australian
1899–1972 Max Theiler South African 1951 Nobel Prize in Physiology or Medicine for developing a vaccine against yellow fever.[16]
1888–1973 Selman Abraham Waksman American 1952 Nobel Prize in Physiology or Medicine for identifying streptomycin and other antibiotics.[17]
(I really hope this helps you out!)